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Finding the Fourth Proportional to 13.75, 20.61 and 8.04

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Solution

The fourth proportional to 13.75, 20.61 and 8.04 is: 12.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.75 : 20.61 = 8.04 : x
  2. Step 2: Convert to fraction form
    13.75/20.61 = 8.04/x
  3. Step 3: Cross multiply
    13.75x = 20.61 × 8.04
  4. Step 4: Simplify right side
    13.75x = 165.72
  5. Step 5: Solve for x
    x = 165.72/13.75
  6. Step 6: Final answer
    x = 12.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.